Create a python tkinter window with no X (close) button
self.dlgWin.overrideredirect(1) will remove all of the buttons (make a borderless window). Is that what you're looking for?
As far as I know, window control buttons are implemented by the window manager, so I think it is not possible to just remove one of them with Tkinter (I am not 100% sure though). The common solution for this problem is to set a callback to the protocol WM_DELETE_WINDOW and use it to control the behaviour of the window:
class _cdlgWin(): def __init__(self,parent,*args): self.parent = parent self.dlgWin = tk.Toplevel() self.dlgWin.protocol('WM_DELETE_WINDOW', self.close) self.userResponse = '' def close(self): tkMessageBox.showwarning('Warning!', 'The pending action has not finished yet') # ...